Al–4.5%Cu合金の固液共存域での応力―ひずみ線図

抄録

The stress–strain curves in semi-solid state of Al–4.5 mass%Cu alloy, whose deformation behaviors had classified into six stages in previous study, were investigated in this study. The mechanical properties, such as elastic modulus, derived from stress–strain curves are necessary to estimate the hot tearing by CAE. Shapes of stress–strain curves in semi-solid state changed with temperature as same as deformation behaviors. Elastic modulus calculated from stress–strain curves were smaller than that calculated by general commercial software. This difference of elastic modulus was about three fingers in Pa. This difference would be caused by the melting of grain boundary and the disappearance of contact between solid phases. Elastic modulus obtained by the stress–strain curve should be more appropriate for CAE than the value calculated by commercial software.